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Connecting Daytime Running Lights via Relay: Handbrake-Off Activation, Wiring Diagram Needed

Manius19888 5952 17
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Jak podłączyć światła do jazdy dziennej przez przekaźnik tak, aby nie zapalały się przy zaciągniętym hamulcu ręcznym i włączały po jego zwolnieniu?

Da się to zrobić albo przez kodowanie modułu centralnej elektryki w VW, albo przez dodatkowy układ sterowania, ale nie ma tu jednego uniwersalnego schematu [#16633360][#16632031] W Golfie 5 i podobnych w module centralnej elektryki można aktywować tryb świateł dziennych, a w wariancie North America przednie światła gasną po zaciągnięciu ręcznego [#16633360] Jako prosty układ zaproponowano tyrystor „od masy”, sterowany sygnałem z przewodu kontrolki hamulca ręcznego podanym przez rezystor [#16632457] Padło jednak ostrzeżenie, że przy prądzie stałym tyrystor zadziała jak zatrzask i pozostanie otwarty, dopóki nie zostanie odłączone napięcie między anodą a katodą [#16632696]
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  • #1 16631466
    Manius19888
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    Hello! I am looking for a diagram on how to connect daytime running lights via a relay, but when the handbrake is on the lights do not turn on, the brake is controlled by a minus as I remember correctly :) I was looking for a pattern and I can't find it :(

    Thank you in advance for your help :)
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  • #2 16631504
    Fredw
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    And good, with the handbrake NO lights have the right to light, the only thing is the indicator.
    Where and how did you connect it?
  • #3 16631510
    Manius19888
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    And that's why I'm looking for a solution how to hook it up :) Because now everyone has a lit car and lights on, and I'm looking for a solution that when the brake applied the lights go out :)
  • #4 16631523
    Fredw
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    You had to plug it in badly.
    On the relay itself, I always did control like this:
    +12 on the ignition switch -> rectifier diode (blocked from the reflector side) -> relay -> position cable from one reflector.
    Daily connections to the relay control circuit probably need not be explained.

    I just don't know how it will work on cars with CAN, because I was installing older / simpler ones.


    By the way, maybe write in what car you assemble and how and where what you connect, those more familiar with this model will tell you where the problem may lie.
  • #5 16631634
    Manius19888
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    So yes, this is the Passat B5 before the lift, gasoline ...

    Maybe I will try to describe more precisely what I mean, I bought the daytime running lights without the machine, and now I want to connect them through the relay in such a way that if the handbrake is applied and the car with the lights on will not light :) and when I release the brake the lights will light up :) Unless you can't, I will buy a machine with this function :)
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  • #6 16631645
    czyt
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    Is this a bajer supposed to be? I did not read in KD that there were such requirements.
    Daytime running lights, led, should be connected to the "battery - from the car" terminal, a fuse with electricity after turning the key and turning the ignition on. An additional 5A fuse can be added.
    There are indicators of manual pulling, but due to the low consumption of this light, it is controlled directly from the contactor or actuator - read the diagram of the car and you will find out where and how.
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  • #7 16631698
    Manius19888
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    Maybe someone will come up with something :) Because probably the relays can handle this :)
  • #8 16631916
    Fredw
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    It is neither useful nor helpful, and may even expose us to the ticket if we find a celestial servant.
    And the first one I hear is that there is a daytime machine in general that performs the function of shutting off after manual puffing :roll:
  • #9 16631925
    Manius19888
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    It's not about the fact that when I pull the hand lights go out, but that when I start the car e.g. in the morning and the hand brake is applied, the daytime running lights do not turn on :)
  • #10 16632031
    Heinzek
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    Fredw wrote:
    And the first one I hear is that there is a daytime machine in general that performs the function of shutting off after manual puffing

    In newer from the VW group this can be set in the central electrics module.

    You need to combine it into something like this:
    Connecting Daytime Running Lights via Relay: Handbrake-Off Activation, Wiring Diagram Needed

    And it will work "in German".
  • #11 16632457
    jdubowski
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    Fredw wrote:
    with handbrake NO lights have the right to light, the only thing is the indicator.
    And as you stop at the traffic lights in the fall. long, manual cycle you take the lights will go out? Some crap ...

    czyt wrote:
    I did not read in KD that there were such requirements.


    There are none, just the reverse, the ignition key is to light the lights.


    Manius19888 wrote:
    It's not about the fact that when I pull the hand lights go out, but that when I start the car e.g. in the morning and the hand brake is applied, the daytime running lights do not turn on :)


    Why such a goodie? It can't be solved, the easiest way is the thyristor from the ground, and you give the signal through the resistor from the cable of the hand brake control.
  • #12 16632617
    Manius19888
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    jdubowski wrote:
    It can't be solved, the easiest way is the thyristor from the ground, and you give the signal through the resistor from the cable of the hand brake control.


    Schemacik? :)
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  • #13 16632696
    Freddy
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    jdubowski wrote:
    Why such a goodie? It can't be solved, the easiest way is the thyristor from the ground, and you give the signal through the resistor from the cable of the hand brake control.
    Only with DC the thyristor will open permanently until the voltage between the anode and cathode is removed :)
  • #14 16633321
    Fredw
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    jdubowski wrote:
    Fredw wrote:
    with handbrake NO lights have the right to light, the only thing is the indicator.
    And as you stop at the traffic lights in the fall. long, manual cycle you take the lights will go out? Some crap ...

    Yes it is, that sometimes man has an eclipse.
    This is what I meant that manual should not affect the exterior lights.
  • #15 16633360
    Heinzek
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    Fredw wrote:
    This is what I meant that manual should not affect the exterior lights.


    In the controller for central electrics in e.g. golf 5 and similar, you have the option of activating daytime running lights. There are two options:
    1. Scandinavian - the passing beam + rear positions are on.
    2. North America - Only the passing lights from the front are on. When the handbrake is applied, they go out.

    In addition, they can be replaced with position or fog lamps and dimmed.
  • #16 16633419
    Freddy
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    Heinzek wrote:
    1. Scandinavian - the passing beam + rear positions are on.
    2. North America - Only the passing lights from the front are on. When the handbrake is applied, they go out.
    We are in Poland and we are bound by Polish regulations if someone forgot :)
  • #17 16633470
    Heinzek
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    Nobody forgets. I just wanted to say that DRL quenching is not just the author's invention.
    In my opinion, DRL quenching is ok, why should they burn when the car is not moving?
    Don't say that every "light" you pull is manual.
  • #18 16633664
    mczapski
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    Interesting issue. The author of the question probably bought DRL LEDs to minimize energy consumption. According to our law, it is forbidden to leave the vehicle with the engine running for a long time (probably 1 minute). So why are such unprofitable inventions minimal energy gain? And when it comes to the durability of the lights themselves, there will also be no gain. And another serious doubt whether the car before traffic lights or in a traffic jam on a hill with the auxiliary brake applied is soon or not.
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Topic summary

✨ The discussion revolves around connecting daytime running lights (DRLs) via a relay in a Passat B5, ensuring that the lights do not activate when the handbrake is applied. The user seeks a wiring diagram and solutions to achieve this functionality. Various responses suggest methods for wiring the relay, including using a rectifier diode and connecting to the ignition switch. Some participants mention the possibility of configuring settings in the central electrics module for newer VW models. Concerns are raised about legal implications and energy efficiency, with suggestions for alternative solutions like using a thyristor. The conversation highlights the complexity of integrating DRLs with existing vehicle systems while adhering to regulations.
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FAQ

TL;DR: To wire DRLs with handbrake‑off activation, use a relay on ignition power and include a 5A fuse—"An additional 5A fuse can be added." [Elektroda, czyt, post #16631645]

Why it matters: This setup stops DRLs from lighting while parked with the handbrake on, then turns them on when you drive.

Who this is for: DIY car owners retrofitting DRLs without a dedicated controller, especially VW Passat B5 owners.

Quick Facts

How do I wire DRLs so they stay off with the handbrake on, then turn on when released?

Use a relay coil fed from ignition +12V and switched by the handbrake signal. Combine with a diode-protected tap from the position light if needed for logic. Place DRLs on the relay’s switched contacts. Add a 5A fuse on the supply. [Elektroda, Heinzek, post #16632031]

Where should I tap ignition and lighting wires on a Passat B5 (pre-facelift)?

Take switched +12V from an ignition-on circuit to the relay coil. For the “lights-on” reference, tap the position-light wire at one headlamp. Keep the DRL load on the relay contacts, not on the small-gauge lighting wire. [Elektroda, Fredw, post #16631523]

Do I need a DRL controller, or will standard relays handle this?

You can do it with standard relays and a diode as control logic. Many installations work fine without a dedicated DRL module if wired cleanly and fused. A controller is optional convenience. [Elektroda, Fredw, post #16631523]

What fuse size should I use for aftermarket DRLs?

Use a single inline 5A fuse close to the battery or ignition feed. This protects the DRL circuit from shorts and wiring faults during installation and operation. [Elektroda, czyt, post #16631645]

My handbrake switch outputs ground (negative). Will this still work?

Yes. Many handbrake switches are ground-switched. Wire the relay coil with ignition +12V on one side and the handbrake ground on the other. The coil energizes only when the brake is released. [Elektroda, Manius19888, post #16631466]

Is it legal to have DRLs turn off when the handbrake is applied?

Regulations vary. A user noted local rules require DRLs with ignition, while others mention OEM modes that extinguish with the handbrake. Check your local road code before wiring. [Elektroda, Freddy, post #16633419]

What about cars with a CAN bus—does this change the approach?

It can. Some vehicles route lighting through control modules. Direct taps may trigger errors. Older cars are simpler; newer CAN-managed cars may require coding or module integration instead. [Elektroda, Fredw, post #16631523]

What DRL modes exist in VW group cars, and which matches handbrake-off behavior?

Two common modes are referenced: Scandinavian (low beam + rear) and North America (front only). In NA mode, DRLs switch off when the handbrake is applied. “When the handbrake is applied, they go out.” [Elektroda, Heinzek, post #16633360]

Can I use a thyristor to manage the handbrake signal?

Avoid it here. On DC, a thyristor latches on until the anode-cathode voltage is removed, which can keep DRLs on unintentionally. A relay and diode solution is safer. [Elektroda, Freddy, post #16632696]

How can I stop DRLs from turning on during cold starts while parked?

Gate the relay coil with the handbrake signal. With the brake applied at startup, the coil stays de-energized and DRLs remain off. Release the brake to light the DRLs. [Elektroda, Manius19888, post #16631925]

Is there a shared diagram for combining ignition, position light, and handbrake signals?

Yes. A contributor posted a diagram showing how to combine these inputs so DRLs behave “in German.” Study the schematic before cutting wires. [Elektroda, Heinzek, post #16632031]

Should the handbrake ever control exterior lights while driving?

One experienced user clarified the handbrake should not affect exterior lights during normal driving. Design your logic to avoid unintended cutoffs at stops. [Elektroda, Fredw, post #16633321]

What is a CAN bus, in simple terms?

Controller Area Network (CAN) is a vehicle data network that lets modules share signals over two wires. Lighting behavior may be software-controlled on CAN cars, affecting DRL retrofits. [Bosch, 1991]

I don’t want to custom-wire this. Should I buy a DRL controller?

You can. The original poster considered a module with this function. A controller with handbrake input simplifies wiring and may add dimming features. [Elektroda, Manius19888, post #16631634]

Quick 3-step: How do I implement the relay-and-handbrake DRL setup?

  1. Add a 5A inline fuse on an ignition-on +12V feed; run to relay coil and common.
  2. Connect the coil’s other side to the handbrake switch line; include a diode if combining with position-light logic.
  3. Wire DRLs to the relay’s switched output; ground DRLs to chassis. [Elektroda, czyt, post #16631645]
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